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HALT HASS Fixturing Solution Examples

Inadequate Resources, Experience and/or Project Timing:

Adaptive Innovations has the experience and resources needed to support any fixturing project, no matter what the project timing may be.  In most cases, experience is the difference when implementing HASS within program timing.  Often, even the most resourceful engineering departments lack experience in the design and development of thermal/vibration fixturing.  If it's not done right the first time, the project will not launch in time.  Additionally, design iterations costs money as well as time.

Maximizing UUT (Units Under Test) Quantities:

Depending on product geometry and production volumes, increasing/maximizing UUT is ideal for HASS testing.  UUT quantities can range from a few large assemblies, to up to 768 or more small PCB cards.  Designing a fixture to utilize available chamber volume, and functional testing abilities, is critical to optimizing any HASS program.

Large Product Size/Weight:

Massive product assemblies can be challenging to fixture efficiently for HASS.  In some cases, a highly engineered fixture (that can hold 4-6 large "server style" products, for example) can save tremendous amounts of HASS dollars by optimizing LN2 usage and available chamber volume.  Fixturing can be the difference in determining how many chambers are required for HASS, as well as keeping the cost per test cycle to a minimum.  Additionally, properly engineered fixturing, for large and heavy UUT, also optimizes operator ergonomics and overall plant safety.

Large server assemblies, in this case, were mounted on pneumatic bearings for installation. Once installed in the fixture, the pneumatics were released and the product was locked down. Cable management can be a challenge with fixtures of this type.

 

Airflow Difficulties:

Products that must be tested in their case/chassis (although not optimal for HALT/HASS testing) can create a challenge for ensuring uniform airflow throughout a UUT, and across a chamber full of UUT.  Fixture layout, optimal material selection, and airflow mechanics can make the difference between a fixture that works, and a fixture that simply holds the specified UUT.

Quick Change-Out Solutions (Thru-put):

Minimizing time between tests results in optimal chamber utilization.  Modular UUT inserts, or cartridges, can be designed to allow faster loading and unloading of massive and/or complex UUT quantities.  UUT's can be pre-loaded into inserts, keeping the actual chamber loading/unloading time to a minimum.  By having two sets of inserts, loading and unloading of product can be done while tests are underway.  Automated loading and unloading of UUT may be considered.

Product/Assembly Response (Transmissibility):

Not all products are constructed in a way that vibration is easily transmitted throughout the product.  Oversized cards and integrated chassis are just two examples of product that don't typically respond with standard fixturing.  The result of inadequate fixturing is poor stimulation, and an ineffective screen.
 

Adaptive Innovations Corporation

1315 Nelson St. Suite 8

Lakewood, CO  80215

Telephone

303-362-0400

FAX

720-554-8042

Email

General Information:
info@a-i-corp.com

 

In some cases we design a custom "fixture insert", designed to house all components, while not using the production chassis. In this case, the production chassis was not ideal for HASS. The "fixture base" gets bolted to the vibration table, and accepts the "fixture inserts". All cables and connectors are within reach for the operator. A High precision fit with the insert guarantees repeatable response to the product. With the "fixture insert" slid and locked into place, this HASS fixture is ready to test. A quantity of inserts can be built to travel with the product as it goes though pre HASS, HASS, burn-in, and any additional testing.

Out of Enclosure Assemblies / Mid-Plane Assemblies:

Some of today's large telecommunication assemblies are designed around a "mid-plane."  This design usually requires the assembly's chassis to be present during all functional testing, resulting in poor transmission of vibration and thermal energy into the sub-assemblies.  To improve the response of the mid-plane and its subassemblies, custom "inserts" can be designed to carry the assembly in final chassis configuration.  The insert travels, assembled with product, through HASS, ESS, Burn-In, Functional Testing, and even open troubleshooting.  Chamber change-out time is minimal and efficient.

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Copyright © 2007 Adaptive Innovations Corporation
Last modified: October 12, 2007